Double socket eccentric rock bit



June 13, 1933.

` t, E'. L. Hai

sa? 1M IIIIIIIII julle E. L. RATH s EccENTRIc Rocx B Patented June 13,1933 UNITED STATES .EDWIN L. RATH, F EDMONTON, ALBERTA, CANADA DOUBLESOCKET ECCENTRIC ROCK BIT Application led March 24, 1932. Serial No.600,989.

This invention relates to a bit that is especially designed for drillingin rock formations, and it principally aims to provide a double socketeccentrically operating bit adapted for use with either the drilling ofdeep oil Wells, for surface drilling, or otherwise, and which has anovel gyratory motlon, to insure engagement with and over the top of anyobstacle in its path, to insure the drilling of a straight hole, andthereby effect a saving in the cost of casing, in the cost of operation,and also providing a construction which has few parts, may beinexpensively manufactured, is faster in operation and will secure theresults generally, in a more speedy and less expensive manner.`

The more specific objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings Figure 1 is a view in central vertical sectionillustrating the improved bit,

Figure 2 is a cross sectional View taken on the line 2--2 of Figure 1,

Figure 3 is a cross sectional view taken on the line 3-3 of Figure 1,

Figure 4 is a vertical central sectional View 30 through the bit takenat a right angle to Figure 1,

Figure 5 is a top view of the disk plate,

Figure 6 is an inverted plan View of said disk plate, v

Figure 7 is a central vertical sectional view through an under reamer,and

Figure 8 is a bottom or inverted plan view of said under reamer.

Referring specifically to the drawings, the 4 bit is carried by a hollowmetallic body, frame or casing generally designated 10, such body beingadapted for connection to a drill string by means of a cap as suggestedat 11, screw threaded at 12 into the body, such cap hav- 5 ing a bore 13and screw threads 14 adjacent the same, facilitating attachment to thedrill line.

At the lower end of the body 10 is a headl adapted to rock or move inengagement with a correspondingly shaped surface afforded -by a lining17 of wear reducing material suitably secured to the body, the latterbeing thickened as at18 to afford a more extended 5i bearing surface. Ashank extends from the hemispherical portion 16, being designated 19 andterminating in a ball 20.

In order to hold the head 15 in place, a tube or the like 21 is arrangeddiametrically of the body 10 and Welded or otherwise secured thereto.Such tube in its under surface has a slot of key hole shape at 22through which the ball 2O and a portion of the shank 19 are adapted toextend, in order that the ball may 6 engage a bearing 23 rigidly securedWithin the tube. Said ball is also engaged by a removable and adjustablebearing block 24, held against detachment from the tube 21 by a nut 25screw threaded therein, and prefer- 7 ably provided with a socket 26 ofa shape facilitating engagement with a wrench. A lock screw may beprovided at 27 to prevent accidental movement of the nut 25. In order toelliciently lubricate the bearings 23 and 24 7* at the zone of contactwith the ball 20, a grease cup or fitting is provided at 28, preferablybeing of the type through which grease is forced under pressure by meansof a grease gun or equivalent. 8 A disk plate or cutting plate isadapted for connection to the head 15, the same being designated 30.Preferably the plate 30 has a stud 31 of conical form detachably screwthreaded at 32 in an opening of the hemi- 8l spherical portion 16. Theplate 30 has an annular ange at 33 and the plate is generally of conicalform at its lower or working surface and over said surface and ange,

a plurality of cutting ribs or teeth 34, pref- 91 erably `V-shape incross section, are formed.

In order that water or lluid may be supplied to the cutting teeth 34,and oil or fluid may be permitted to escape from the well, registeringcirculation ports or passages are provided at 34 and 35 in thehemispherical portion 16 and plate 30.. In addition, and for the samepurpose, such portion 16 and plate 30 are spaced apart as at 36 and thespace has passages 37 leading therefrom to the teeth. The space 36 isprovided, by the engagement of spacing lugs 38, which may be provided onthe plate 30, contacting wlth the hemispherical vportion 16. Obviouslysaid spacing members 38 may be provided on the portion 16' in lieu ofthe plate 30, 1f desired.

In order to eliciently lubricate ,the zone of engagement of thehemispherical portion 16 and lining 17, a lubricant reservoir 1sprovided within the body 10 as at 40. Lubricant from the reservoir 4:0is adapted to flow through a tube 41, secured to the body 10 and incommunication with a port or passageway 42 which leads directly throughthe lining 17 and to the said zone, the lubricant lowing from the tank40 by gravity.

As a result of the construction described, the rotation of the bod 10imparts a sort of wobbling motion to t e head 15 whereby the teeth 34oneby one and successivel come in contact with the rock or soil beingrilled. The surface of the cutter 30 engaging the rock or earth, issubstantially parallel thereto, thus positively engaging all material inthe path of cutting and avoiding any sliding motion of the teeth,especially insuring straight drilling in the case of encountering ananticline. This feature also tends to keep the teeth sharp and theeccentric mounting shown is a double swivel mounting to the' head andalso provides longer teeth on the plate 30, within the confines of theimaginary cylinder extended from the body 10.

In lieu of the cutter plate 30, a cutter plate 50 may be substituted aswhen enlarging a hole or underreaming. The cutter 50 is detailed inFigures 7 and 8 and substantially corresponds to the construction of thecutter 30 aside from the fact that the under surface is sphericallyconcaved as at 51 and has cutting teeth 52, triangular in cross sectionbut radially conforming to such concave form. rIhe cutter 50 by means ofa threaded stud 5,3, may be screwed into the opening or socket 32. Saidcutter 50 also has passages or ports 54 therethrough adapted to functionsimilarly to the ports or passages at 35 and 37 and f' in addition, suchcutter 50 has spacing lugs, l preferably integral therewith, at 55, tofunction-similarl to those at 38.

Various c anges may be resorted to provided they fall within the spiritand scope ofv the invention.

I claim as my invention l. A rock bit comprising a carryin body, a toolrotatably mounted on the bo y, said tool consisting of a head, a cutteron the lower end of said head and having its longitudinal axis inclinedwith respect to the body axis, said head and cutter having fluidpassages therethrough, a flange on the cutter surrounding the head andforming part of the cutting surface, and means spacing the cutter andhead apart at portions thereof for remesa the passage of Huidtherebetween.

2. A rock bit having a body, a rotatable head havin respect to t e bodyaxis, said head having a hemispherical portion in bearing contact withthe body, means disposed diametrically on the body providing a bearing,a shank extending from said portion having a ball removably connected toand journaled in the bearing, and cutting teeth on said portion.

3. A borin tool of the class described comprising a bo y, a tube securedin said body, a bearin carried by the tube and having a removab e part,said tube having a key hole slot, means to secure said movable bearingpart in the tube, a rotatable shank having a ball located between saidbearing members and applicable through said slot, a hemisphericalportion carried by the shank and having bearing contact with the body,and cutting means carried by the said portion.

In testimony whereof I affix my signature.

i EDWIN L. BATH.

its axis of rotation inclined with

